mediawiki: manage with puppet on all nodes

Now all the apache config on mediawiki appservers is managed via puppet,
on all nodes. A change to the apache config will not trigger a refresh of
the apache service. You will still need to run apache-graceful-all after
a change.

Change-Id: I282f371685feca8144cacb0092521b0f6a78293c
Signed-off-by: Giuseppe Lavagetto <glavagetto@wikimedia.org>